用于亲和分离的尼龙膜的改性

采用先水解再键合羟乙基纤维素的方法对尼龙6膜进行改性,使膜上的可反应基团数目由10μmol/g膜增加至178μmol/g膜,并且增加 了膜的亲水性,使膜基质对蛋白质的非特异性吸附大大降低。羟乙基纤维素改性膜对牛γ－球蛋白的吸附量由5．53mg/g膜降到0．95mg/g膜,对牛血清白蛋白的吸附量由1．51mg/g膜降到0．羟乙基纤维素改性后膜的孔径为原始膜的78％－82％。改性后的膜适宜用做亲和分离介质。     

几种热致液晶性纤维素衍生物的制备及性能的研究

以纤维素或羟乙基纤维素为原料，通过酯化反应制备了乙酰氧乙基纤维素（ＡＥＣ）、苯甲酰氧乙基纤维素（Ｂ２ＥＣ）和苯甲酰氧纤维素（Ｂ２Ｃ）。采用ＦＴ－ＩＲ和元素分析表征了产物结构，通过用ＤＳＣ、ＨＳＰＬＭ和ＷＡＸＤ研究了产物的致热液晶织构和性能。Ｂ２Ｃ的热致液晶性最强，其各向同性液态转变温度（ＴＬＩ＝８２℃）和转变热焓（ΔＨＬＩ＝１４．８８Ｊ／ｇ）是迄今报导的热致液晶纤维素衍生物中最高的。     

三甲基硅基羟乙基纤维素的合成及表征

以六甲基二硅胺烷(HMDS)作为硅烷化试剂,合成了三甲基硅基羟乙基纤维素.采用红外光谱及核磁共振对产物的结构进行了表征.研究了反应温度、反应时间、共溶剂等因素对羟乙基纤维素甲硅烷基化率的影响.结果表明,当TMCS(三甲基氯硅烷)/OH的摩尔比率为0.2,共溶剂甲苯/DMSO的体积比为2:3,反应温度为60℃,反应时间为24h,HMDS/OH的摩尔比率为2时,所得三甲基硅羟乙基纤维素的甲硅烷基化率可达到83.2%.并建立了用气相色谱法测定甲硅烷基化率的方法.     

乙基纤维—二亚水杨基邻苯二胺钴共混富氧膜的研究

以压缩空气为气源，采用恒压体积法详细地研究了乙基纤维膜及一系列不同比例的乙基纤维素－二亚水杨苛邻苯二胺钴共混膜的富氧性能。结果表明，乙基纤维素－二亚水杨基邻苯二胺钴共混的富氧性能皆比乙基纤维素膜的富氧性能高，并且在０．５ＭＰａ，６０℃条件下，乙基纤维素－二亚水杨基邻苯二胺钴共混富氧膜的富氧空气的渗透速率Ｐ及一级富氧浓度分别可达２．３４＊１０＾６Ｂａｒｒｅｒ，４０％。     

微波辐射合成耐盐性羟乙基纤维素高吸水性树脂

以羟乙基纤维素为原料,丙烯酰胺和马来酸酐为接枝单体,N,N'-亚甲基双丙烯酰胺为交联剂,过硫酸胺为引发剂,采用微波辐射技术合成一种新型耐盐型羟乙基纤维素-丙烯酰胺-马来酸酐接枝共聚高吸水性树脂,探讨了微波辐射功率、混合单体AM/MAA比例、羟乙基纤维素浓度、交联剂以及引发剂用量对树脂吸盐水能力的影响.最佳合成条件为:微波辐射功率为400W且间歇加热12min、AM/MAA摩尔比为0.45,羟乙基纤维素浓度为3.0%、交联剂用量为2.0%、引发剂用量为0.15%,制得的高吸水性树脂最大吸盐水率达167g·g-1.     

乙基纤维素-二亚水杨基邻苯二胺钴共混富氧膜的研究

以压缩空气为气源，采用恒压体积法详细地研究了乙基纤维素膜及一系列不同比例的乙基纤维素－二亚水杨基邻苯二胺钴共混膜的富氧性能。结果表明，乙基纤维素－二亚水杨基邻苯二胺钴共混膜的富氧性能皆比乙基纤维素膜的富氧性能高，并且在０．５ＭＰａ，６０℃条件下，乙基纤维素－二亚水杨基邻苯二胺钴共混富氧膜（９４∶６）的富氧空气的渗透速率Ｐ及一级富氧浓度分别可达２．３４×１０６Ｂａｒｒｅｒ，４０％。     

纤维素共聚物的酶降解研究

研究了羟乙基纤维素（ＨＥＣ）分别与甲基丙烯甲酯（ＭＭＡ）和丙烯酸（ＡＡ）在超声波辐照作用下的共聚反应，并研究了共的的纤维素酶降解，对降解产物进行了表征与分析。     

新型功能材料阳离子纤维素的研究进展

总结了制备阳离子纤维素的主要方法,介绍了纤维素阳离子化改性所用的单体类型,评价了制备阳离子纤维素方法的特点。综述了国内外阳离子纤维素应用于日化用品、纺织印染、生物医学和环境保护等领域的研究进展,并讨论了该功能材料的发展趋势,指出阳离子纤维素将会在医疗和环保领域得到广泛的应用。     

离子液体中阳离子纤维素的制备及对酸性蓝40的吸附性能

以离子液体1-丁基-3-甲基咪唑氯盐(BMIMCl)为溶剂、丙烯酰氧乙基三甲基氯化铵(AETAC)为阳离子单体合成了高效的阳离子改性纤维素材料。将纤维素溶解于BMIMCl中,在溶液状态通过自由基聚合接枝阳离子单体,采用相分离法制得产物。红外光谱和元素分析表明单体已成功接枝到纤维素上,扫描电镜和X射线衍射仪分析表明阳离子纤维素的样品呈多孔结构,晶型从纤维素Ⅰ型变为纤维素Ⅱ型,结晶指数从80.33%降至53.81%。阳离子纤维素对酸性蓝40具有优良的吸附能力,在中性、无盐条件下吸附效果最好,理论平衡吸附量可达到448.43 mg/g。吸附类型属于化学吸附,吸附过程符合Langmuir吸附等温线模型和伪二阶吸附动力学方程。吸附剂可循环使用,NaOH溶液可作为解吸溶液。     

羟乙基纤维素对单独加工彩色拷贝声带质量的影响

本文研究了含羟乙基纤维素溶液对显影液成分的稳定性和显影液配方中的羟乙基纤维素对照相性能和声学性能的影响。选择苏联生产的标号为-30 6-05-221-317-75,批号为1212的羟乙基纤维素和苏联国家标准6-05-386-80标号为85-500,批号为334羧甲基纤维素,配制成粘性显影液,并进行     

疏水缔合羟乙基纤维素的合成工艺

通过羟乙基纤维素(HEC)与溴代十二烷(简称BD)的大分子反应制得疏水缔合羟乙基纤维素(简称BD-HAHEC),系统研究了合成工艺参数如反应温度、反应时间、活化剂浓度、HEC浓度及疏水单体用量对其增粘性能的影响;通过优化改性工艺参数,获得了具有较高增粘性的BD-HAHEC;并用傅立叶红外光谱仪(FT-IR)、差式扫描量热仪(DSC)和Brookfield转子粘度仪对产品进行了表征。     

顺丁烯二酸酐固相接枝羟乙基纤维素的制备与性能

以N,N-二甲基甲酰胺(DMF)为增塑剂,在无催化剂和溶剂条件下制备了羟乙基纤维素(HEC)和顺丁烯二酸酐(MAH)的酯化产物。通过酸碱滴定法测定酯化率和酯化效率,对酯化反应工艺进行了考察。采用FT-IR表征了产物结构,证明反应主要由MAH酸酐开环和HEC羟基酯化实现,并通过广角X射线衍射(WAXD)和热重分析(TG)对产物进行了进一步研究。结果表明,酯化反应后HEC结晶结构没有明显变化,热稳定性有了较大提高,最大分解温度从268℃提高到300℃左右。     

Triethylenetetramine/hydroxyethyl cellulose-functionalized graphene oxide monoliths for the removal of copper and arsenate ions

Nitrogen-doped graphene oxide monoliths (GOMs) were readily constructed by crosslinking graphene oxide (GO) using triethylenetetramine (TETA) and hydroxyethyl cellulose (HEC). The addition of HEC was beneficial to the formation of a network structure compared to that in the absence of HEC. The generated monoliths have shown various morphologies with different d spacing, layer thickness, and micropore size. Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS) analyses provided evidences for the formation of covalent C–N bonds and some nitrogen-containing heterocyclic composition inside the graphene oxide sheet, indicating that the interaction of GO with the amine crosslinker involved the crosslinking reaction between GO epoxides and amine groups. HEC was also involved in the N-doping reaction via the partial reduction of oxygen in HEC molecules. Analysis of X-ray diffraction (XRD) results indicated that the lattice distance between GO sheets increased after TETA/HEC crosslinking. Thermogravimetric analysis (TGA) confirmed the successful incorporation of crosslinker moieties on the surface of GO sheets. The fabricated GOMs could be used to efficiently adsorb metal ions and arsenate by the introduced polar functional groups on GO sheets and porous structures based on hydrogen bonds, whose morphologies and compositions were confirmed via XRD, scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS).     

Calcium carbonate growth in the presence of water soluble cellulose ethers

Calcium carbonate precipitation was performed in the presence of methyl cellulose (MC) and two kinds of hydroxyethyl cellulose (HEC FD-10000, HEC FD-30000). The results demonstrated that the final product morphology and structure of CaCO₃ crystals are highly sensitive to the concentration of the cellulose ethers aqueous solution. By precisely controlling their concentrations, all these three cellulose ethers solutions have the ability of protecting metastable vaterite from thermodynamically transforming into stable calcite. The intermediate products investigation showed to some extent the phase transformation of calcium carbonate in its growing process from metastable vaterite to calcite and indicated that the calcium carbonate crystal growth in HEC solutions occurs through dissolution and reprecipitation process. Calcium carbonate growth in both presence of HEC and ethanol or Mg²⁺ was also examined. This work demonstrates the potential of water soluble cellulose ethers in controlling biominerals crystallization and growth. The results are revelatory for biomineralization and fabricating new organic–inorganic hybrids based on cellulose derivatives.     

羟乙基纤维素/壳聚糖涂膜液对蓝莓的保鲜效果研究

以羟乙基纤维素和壳聚糖为原料制备新型共混涂膜液,以其对蓝莓进行涂膜保鲜处理,并与以壳聚糖涂膜液处理及未作处理的蓝莓进行对比,研究共混涂膜液对蓝莓贮藏期间品质的影响.结果表明:共混涂膜液能够有效地降低蓝莓的失重率和腐烂率,在贮藏后期,能够减缓果实硬度的下降速度;采用共混涂膜液处理后,果实的可溶性固形物含量、Vc含量以及花青素含量均呈现出最小的变化.     

Preparation and In Vitro Evaluation of Controlled Release Hydrophilic Matrix Tablets of Ketorolac Tromethamine Using Factorial Design

Controlled release matrix tablets of ketorolac tromethamine (KT) were prepared by direct compression technique using cellulose derivatives as hydroxypropylmethyl cellulose (HPMC), hydroxyethyl cellulose (HEC), and carboxymethyl cellulose (CMC) in different concentrations (10–20%). The effect of polymer type and concentration was investigated on drug release by 2³ factorial design. For the quality control of matrix tablets, weight deviation, hardness, friability, diameter–height ratio, content uniformity of KT, and in vitro dissolution technique were performed. UV Spectrophotometric method was used to detection of KT in matrix tablets. This method was validated. Dissolution profiles of the formulations were plotted and evaluated kinetically. An increase in polymer content resulted with a slow release rate of drug as was expected. According to the dissolution results, tablets prepared with HPMC + HEC + CMC (F1 and F8) were found to be the most suitable formulation for KT. About 99.27% KT was released from F8 in 7 h.     

碳湿敏元件非线性感湿特性的影响因素

研究了不同配比导电炭黑和羟乙基纤维素(HEC)感湿胶制备的碳湿敏元件的感湿特性,探讨了山梨醇增湿剂对感湿非线性特性的影响。对碳湿敏元件的体积电阻率、湿敏特性和复阻抗谱的测试结果表明,炭黑含量和山梨醇含量对非线性感湿特性有很大影响,2%炭黑试样在80%湿度附近开始出现电阻的非线性增大;适量山梨醇使试样的非线性湿度响应移向较低湿度区。试样的复阻抗谱在54%湿度时为1个带拖尾的半圆弧,80%湿度时变为带拖尾的2个半圆弧,更高湿度时是拖尾拉长变形明显的2个半圆弧,表明其等效电路是由包括体电阻、炭黑粒界电阻和电极接触电阻三个阻容并联体的串联组成。半圆弧数目随湿度增加的现象,与感湿膜中水分子增加使不同极化机制的作用变得更加明显有关。     

疏水缔合羟乙基纤维素水溶液的流变性及驱油性能

研究了疏水缔合改性羟乙基纤维素(BHEC)水溶液的流变性和驱油性能。结果表明,BHEC的临界缔合浓度在4000 mg/L左右,其增粘性能是HEC的近22倍;NaCl对BHEC水溶液有促进作用,当NaCl含量达到100000 mg/L时,BHEC的表观黏度仍然稳定在699.9 mPa.s,说明其具有良好的抗盐性。BHEC水溶液达到临界缔合浓度才具有粘弹性,并随着聚合物浓度的增加,聚合物溶液的粘弹性越显著,振荡频率越高,损耗因子越低。浓度为6000 mg/L的BHEC水溶液可在水驱基础上提高原油采收率25%~32%。